<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    var str = '你!真!好'

    // console.log( str.replace('好', '坏') )  // 替换
    // console.log( str )

    // console.log( str.split('真') )  // 切割 成 数组
  </script>
</body>
</html>
